Add support for get/put reserved regions.

Signed-off-by: Navneet Kumar <navne...@nvidia.com>
---
 drivers/iommu/tegra-smmu.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 4b43c63..e848a45 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -22,6 +22,9 @@
 #include <soc/tegra/ahb.h>
 #include <soc/tegra/mc.h>
 
+#define MSI_IOVA_BASE  0x8000000
+#define MSI_IOVA_LENGTH        0x100000
+
 struct tegra_smmu_group {
        struct list_head list;
        const struct tegra_smmu_group_soc *soc;
@@ -882,6 +885,31 @@ static int tegra_smmu_of_xlate(struct device *dev,
        return iommu_fwspec_add_ids(dev, &id, 1);
 }
 
+static void tegra_smmu_get_resv_regions(struct device *dev,
+               struct list_head *head)
+{
+       struct iommu_resv_region *region;
+       int prot = IOMMU_WRITE | IOMMU_NOEXEC | IOMMU_MMIO;
+
+       region = iommu_alloc_resv_region(MSI_IOVA_BASE, MSI_IOVA_LENGTH,
+                                       prot, IOMMU_RESV_SW_MSI);
+       if (!region)
+               return;
+
+       list_add_tail(&region->list, head);
+
+       iommu_dma_get_resv_regions(dev, head);
+}
+
+static void tegra_smmu_put_resv_regions(struct device *dev,
+               struct list_head *head)
+{
+       struct iommu_resv_region *entry, *next;
+
+       list_for_each_entry_safe(entry, next, head, list)
+               kfree(entry);
+}
+
 static const struct iommu_ops tegra_smmu_ops = {
        .capable = tegra_smmu_capable,
        .domain_alloc = tegra_smmu_domain_alloc,
@@ -896,6 +924,9 @@ static const struct iommu_ops tegra_smmu_ops = {
        .iova_to_phys = tegra_smmu_iova_to_phys,
        .of_xlate = tegra_smmu_of_xlate,
        .pgsize_bitmap = SZ_4K,
+
+       .get_resv_regions = tegra_smmu_get_resv_regions,
+       .put_resv_regions = tegra_smmu_put_resv_regions,
 };
 
 static void tegra_smmu_ahb_enable(void)
-- 
2.7.4

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